1997 Mercury Tracer Mileage: 82,000. My car is in the shop right now and the mechanics are stumped The car was idling at 3/4 rpm when you start it up and as you drive, it would be okay and then rev up. It would stall at a stop. I would have to press hard on the brake to stop and it would rev and push my foot. They changed my EGR valve, a complete tune up; they said some sensors were out. So they fixed that and the car still does it. They put in a new computer, still doing it. They checked the mass air sensor, still doing it. They said they just don't know; they are looking into maybe a faulty wire. I am getting so stressed and so are they.